Percolator.



J. F. SMART.

- PERCOLATOR.

APPLICATION FILED MAY 1. 1917.

Patented Feb. 25

Tl TED STATES PATENT QFFTCE.

JOSEPH F. SMART, OF NEVT BRITAIN, CONNECTICUT, ASSIGNOR TO LANDERS, FRARY & CLARK, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

Application filed May 1, 1917.

To all whom it may concern:

Be it known thatI, JOSEPH F. SMART, a citizen of the United States, residing at New Britain, county of Hartford, State of Connecticut, have invented a certain new and useful Improvement in Percolators, of which the following is a full, clear, and exact description.

My invention relates to improvements in percolators and has for its object to provide an interior element for a percolator constructed in such a manner as not to have at its lower end a screw-threaded or soldered joint at the connection of the steam-chamber-cover with the circulating pipe, although those two parts are separately formed.

The following is a description of an embodiment of my invention, reference being had to the accompanying drawings, in which:

Figure 1 shows an interior percolator element embodying my invention, the upper portion being in side elevation and the lower portion being in section;

Fig. 2 is an end view of the circulating pipe before it is secured to the cover of the steam-chamber Fig. 3 shows a side elevation of the lower portion of the pipe, together with a section of the steam-chamber-cover on the line 3-3, Fig. 4:, before the two are united;

Fig. 4: is a plan view of the steam-chamber-cover before it has been secured to the circulating pipe, and

Fig. 5 is a sectional view on the line 55, Fig. 1, showing portions of the steam-chamber-cover and circulating pipe in their normal relations when secured to one another.

Referring more particularly to the drawings, 1 is a tubular member of aluminum constituting the circulating pipe of an interior percolator element, and having near its bottom a swaged shoulder or projection 2, as shown in Fig. 1. 3 is an aluminum member forming a cover for producing a steam chamber, the said cover being provided at its top with a boss 3 having a perforation l extending therethrough, the upper portion of said perforation being provided with laterally extending recesses or cavities P removed from the lower end of said perforation, and with slight undercuts 4: located between the cavities 4 The percolator tube at a point immediately below the projection or shoulder 2 is corrugated so as to produce Specification of Letters Patent.

PERCOLATOR.

Patented Feb. 25, 1919.

Serial No. 165,662.

an additional annular projection and flange and has portions extending into said cavities 4: and 4*, so as to bind the tube and cover together and prevent them from turning relatively to one another. The lower end of the tube flares outwardly at 6 so as to be expanded into a flange in engagement with the metal. at the lower end of the perforation 4 in the cover and assist in the holding of the parts. The metal of the cover engages with the additional projection and flange referred to, and with the lower surface of the shoulder or projection 2, the engagement being a close and binding engagement and forming a strong and rigid connection between the tube 1 and the cover.

In forming this combined tube and cover, I first form the cover 3 with its boss 3*, perforation at and recesses 4 and 4 as shown in Figs. 3 and 4. I then form the tube 1 with the shoulder 2, as shown in Figs. 2 and 3. I then place the lower end of the tube 1 within the perforation 4: in the cover so that the flange or projection 2 is in engagement with the top of the boss 3*, and, by means of a suitable die and plunger, force the cover 3 farther into the tube 1, so as to bring the metal of the boss 3 into close and binding engagement with the lower surface of the projection 2 and strike the end of the tube, so as to produce a corrugation therein directly below the projection 2 and expand its lower end. This forcing, corrugating and expanding is all done by a single action of a press-operated swaging and upsetting die and plunger. As the outwardly extending corrugation immediately below the projection 2 is formed, some of the metal at that point is forced into the recesses 49 and 4 of the cover, while metal of the boss is forced inward toward the axis of the tube so as to establish the desired holding relations.

A joint thus formed is found to be strong and firm and, as will be seen, is produced without requiring the use of screw-threads or solder, although the two members joined together are separately formed.

As will be evident to those skilled in the art, my invention permits of various modifications without departing from the spirit thereof or the scope of the appended claim.

What I claim is: In a percolator element a steam-chambercover having on its top portion a perforated boss, the perforation being formed with lat-.

erallydisposed recesses adjacent to its upper end and removed from its lower end, a tubular member having a surrounding shoulder near" its lower end and being corrugated below said shoulder, so as to form an additional annular projection and end flange, said second projection having portions eX- tending into said recesses to anchor said tube against rotation relatively to said cover, the metal of the boss bein in close and binding engagement With the oWer surface of said shoulder and With said second projection and flange of the corrugated portion below said shoulder.

JOSEPH F. SMART.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, .D. Cl 

